Fan-favorite creators Kurt Busiek and George Pérez craft a new era for Earth's Mightiest Heroes! The Avengers forge an uneasy alliance with the Thunderbolts to face Count Nefaria - but the true threat comes from the stars as Earth is declared a cosmic maximum-security prison for alien criminals! To save their planet, and contend with hordes of rampaging Hulks and the spawn of Ultron, the Avengers must rebuild their operation bigger and better than ever.